When using the Virus|Control plug-in, your soundcard isn't exactly processing anything of the Virus. All the sounds and controls of the Virus are controlled through what you do in Cubase. Since Virus|Control uses USB, all audio is recorded through that USB port if you actually do any recording to audio, regardless of whether or not the FF800 or Virus TI is your sound card.
To use the Virus using the Virus|Control plug-in, it must be instantiated in Cubase first (Setup > VST Instruments or by pressing F11). You should now see "Virus TI" as a MIDI output option. The MIDI channels on the MIDI track correspond to the 16 available parts in the Virus.
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